Light source module and projection device

ABSTRACT

A light source module and a projection device are provided. The light source module is configured to provide a laser beam and includes multiple laser source units and a focusing lens. The laser source units include a first laser source unit, a second laser source unit, a third laser source unit and a fourth laser source unit respectively configured to provide a first laser beam, a second laser beam, a third laser beam and a fourth laser beam. The focusing lens is located on transmission paths of the first laser beam, the second laser beam, the third laser beam and the fourth laser beam. The first laser beam, the second laser beam, the third leaser beam and the fourth laser beam are respectively incident on the focusing lens along a first direction. The first laser source unit and the second laser source unit are arranged along a second direction.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. application Ser.No. 17/165,856, filed on Feb. 2, 2021, which claims the priority benefitof China application no. 202010080311.9, filed on Feb. 5, 2020. Theentirety of the above-mentioned patent applications is herebyincorporated by reference herein and made a part of this specification.

BACKGROUND Technical Field

The disclosure relates to an optical module and an optical deviceincluding the optical module, and more particularly to a light sourcemodule and a projection device.

Description of Related Art

Recently, projection devices based on solid-state light sources such aslight-emitting diodes (LEDs) and laser diodes have gradually gained aplace in the market. Generally speaking, the excitation light ofsolid-state light sources will be converted by the wavelength conversionmaterial on the wavelength conversion module in the projection device togenerate different colors of converted light. In addition, in order tomeet the requirements of color performance, a filter module is placed onthe rear light path of the projection device. The converted light on thewavelength conversion module is filtered by the filter module to filterout predetermined color lights. The color lights project the image beamto the outside via the modulation of the light valve.

Specifically, in recent years, light-emitting units of a multi-colorlaser (MCL) have been applied to the mainstream models of projectiondevices (for example, models with a luminous flux of about 2,000 lumensto 5000 lumens). Generally speaking, when the light-emitting units ofthe MCL are applied to the aforementioned models of the projectiondevices, the target brightness can be achieved with the number oflight-emitting units thereof being about 1 to 2.

However, when being applied to models of projection devices having highbrightness requirements, the number of light-emitting units of the MCLneeds to be increased accordingly. In this way, the space requirementsof the combined light path designs in the projection devices areincreased accordingly and the space design requirements for configuringcircuit connections, mechanism fixings, connections of heat dissipationpipes, etc. of the MCL also need to be changed accordingly, so as totake into account the overall optical, electrical, and heat conductivityefficacy. In this way, it will not be easy to reduce the size of theoverall device and the design difficulty of relevant light path designsand mechanism configurations will also be increased.

The information disclosed in this Background section is only forenhancement of understanding of the background of the describedtechnology and therefore it may contain information that does not formthe prior art that is already known to a person of ordinary skill in theart. Further, the information disclosed in the Background section doesnot mean that one or more problems to be resolved by one or moreembodiments of the invention was acknowledged by a person of ordinaryskill in the art.

SUMMARY

The disclosure provides a light source module having a small volume anda simple light path design.

The disclosure provides a projection device having a small volume and asimple light path design.

Other objectives and advantages of the disclosure can be furtherunderstood from the technical features disclosed by the disclosure.

In order to achieve one, a part, or all of the foregoing objectives orother objectives, an embodiment of the disclosure provides a lightsource module. The light source module is configured to provide a laserbeam and includes multiple laser source units, a first light combiningunit, a second light combining unit and a focusing lens. The multiplelaser source units include a first laser source unit, a second lasersource unit, a third laser source and a fourth laser source respectivelyconfigured to provide a first laser beam, a second laser beam, a thirdlaser beam and a fourth laser beam. The first light combining unit has afirst reflection region and a first transmission region. The secondlight combining unit has a second reflection region and a secondtransmission region. The focusing lens is located on transmission pathsof the first laser beam, the second laser beam, the third laser beam andthe fourth laser beam. The first laser beam, the second laser beam, thethird laser beam and the fourth laser beam are respectively incident onthe focusing lens along a first direction. The first laser source unitand the second laser source unit are arranged along a second direction.When viewed along a third direction, the first laser source unit and thesecond laser source unit do not overlap. When viewed along the seconddirection, the first laser source unit and the second laser source unitare displaced up and down, and the first laser source unit and thesecond laser source unit are partially overlapped. The third laser beamis reflected by the second reflection region of the second lightcombining unit, and the fourth laser beam is reflected by the firstreflection region of the first light combining unit. The firstdirection, the second direction, and the third direction areperpendicular to one another.

In order to achieve one, a part, or all of the foregoing objectives orother objectives, an embodiment of the disclosure provides a projectiondevice. The projection device includes an illumination system, a lightvalve, and a projection lens. The illumination system is suitable forproviding an illumination beam and includes the light source module. Thelight valve is disposed on a transmission path of the illumination beamand is suitable for converting the illumination beam into an image beam.The projection lens is disposed on a transmission path of the image beamand is suitable for projecting the image beam out of the projectiondevice.

Based on the above, the embodiments of the disclosure have at least oneof the following advantages or effects. In the embodiments of thedisclosure, by configuring the first laser source unit and the secondlaser source unit with a displaced arrangement, the projection deviceand the light source module enable the first laser source unit and thesecond laser source unit to be disposed on the same plane and to haveheat dissipation modules independent from each other and heat pipesthereof, so as to realize miniaturization of the projection device andthe light source module and to have a simple light path design. Inaddition, by disposing a first light combining unit and a second lightcombining unit, the projection device and the light source module enablethe first laser beam, the second laser beam, the third laser beam, andthe fourth laser beam to be uniformly incident on each region of a lightincident surface of the focusing lens, so as to improve the lightreceiving efficiency, such that the illumination beam can have a goodcolor performance.

Other objectives, features and advantages of the present invention willbe further understood from the further technological features disclosedby the embodiments of the present invention wherein there are shown anddescribed preferred embodiments of this invention, simply by way ofillustration of modes best suited to carry out the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are included to provide a furtherunderstanding of the invention, and are incorporated in and constitute apart of this specification. The drawings illustrate embodiments of theinvention and, together with the description, serve to explain theprinciples of the invention.

FIG. 1 is a schematic view of a structure of a projection deviceaccording to an embodiment of the disclosure.

FIG. 2A is a perspective view of a structure of a light source module ofFIG. 1 .

FIG. 2B is a top view of the light source module of FIG. 1 .

FIG. 2C is a front view of the light source module of FIG. 1 .

FIG. 3A and FIG. 3C are schematic views of different structures of afirst laser source unit and a second laser source unit of FIG. 2A.

FIG. 3B is a perspective view of each laser source unit of FIG. 2A.

FIG. 3D is a schematic view of a structure of a first light combiningunit or a second light combining unit of FIG. 2A.

FIG. 4A to FIG. 4B are schematic view of structures of a first lightcombining unit and a second light combining unit according to anotherembodiment of the disclosure.

FIG. 5A to FIG. 5B are schematic views of structures of a first lightcombining unit and a second light combining unit according to yetanother embodiment of the disclosure.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

In the following detailed description of the preferred embodiments,reference is made to the accompanying drawings which form a part hereof,and in which are shown by way of illustration specific embodiments inwhich the invention may be practiced. In this regard, directionalterminology, such as “top,” “bottom,” “front,” “back,” etc., is usedwith reference to the orientation of the Figure(s) being described. Thecomponents of the present invention can be positioned in a number ofdifferent orientations. As such, the directional terminology is used forpurposes of illustration and is in no way limiting. On the other hand,the drawings are only schematic and the sizes of components may beexaggerated for clarity. It is to be understood that other embodimentsmay be utilized and structural changes may be made without departingfrom the scope of the present invention. Also, it is to be understoodthat the phraseology and terminology used herein are for the purpose ofdescription and should not be regarded as limiting. The use of“including,” “comprising,” or “having” and variations thereof herein ismeant to encompass the items listed thereafter and equivalents thereofas well as additional items. Unless limited otherwise, the terms“connected,” “coupled,” and “mounted” and variations thereof herein areused broadly and encompass direct and indirect connections, couplings,and mountings. Similarly, the terms “facing,” “faces” and variationsthereof herein are used broadly and encompass direct and indirectfacing, and “adjacent to” and variations thereof herein are used broadlyand encompass directly and indirectly “adjacent to”. Therefore, thedescription of “A” component facing “B” component herein may contain thesituations that “A” component directly faces “B” component or one ormore additional components are between “A” component and “B” component.Also, the description of “A” component “adjacent to” “B” componentherein may contain the situations that “A” component is directly“adjacent to” “B” component or one or more additional components arebetween “A” component and “B” component. Accordingly, the drawings anddescriptions will be regarded as illustrative in nature and not asrestrictive.

FIG. 1 is a schematic view of a structure of a projection deviceaccording to an embodiment of the disclosure. Please refer to FIG. 1 . Aprojection device 200 includes an illumination system LS, a light valve210, and a projection lens 220. The illumination system LS is suitablefor providing an illumination beam 70. The light valve 210 is disposedon a transmission path of the illumination beam 70 and is suitable forconverting the illumination beam 70 into an image beam 80. Theprojection lens 220 is disposed on a transmission path of the image beam80 and is suitable for projecting the image beam 80 out of theprojection device 200. In the embodiment, the number of the light valve210 is one, but the disclosure is not limited thereto. In otherembodiments, the number of the light valve 210 may also be multiple. Inaddition, in the embodiment, the light valve 210 may be a digitalmicro-mirror device (DMD) or a liquid crystal-on-silicon panel (LCOSpanel). However, in other embodiments, the light valve 210 may also be atransmissive liquid crystal panel or other beam modulators.

Specifically, as shown in FIG. 1 , in the embodiment, the illuminationsystem LS includes a light source module 100, a wavelength conversionmodule PM, and a filter module FM. The structure of the light sourcemodule 100 will be further described below with reference to FIG. 2A toFIG. 3D.

Please refer to FIG. 2A to FIG. 3D. FIG. 2A is a perspective view of astructure of a light source module of FIG. 1 . FIG. 2B is a top view ofthe light source module of FIG. 1 . FIG. 2C is a front view of the lightsource module of FIG. 1 . FIG. 3A and FIG. 3C are schematic views ofdifferent structures of a first laser source unit and a second lasersource unit of FIG. 2A. FIG. 3B is a perspective view of each lasersource unit of FIG. 2A. FIG. 3D is a schematic view of a structure of afirst light combining unit or a second light combining unit of FIG. 2A.Specifically, as shown in FIG. 2A to FIG. 2C, in the embodiment, thelight source module 100 is configured to provide a laser beam 50 (shownin FIG. 1 ) and includes multiple laser source units 110, a first lightcombining unit 120, a second light combining unit 130, and a focusinglens 140.

More specifically, as shown in FIG. 2A to FIG. 2C, in the embodiment,the multiple laser source units 110 include a first laser source unit111, a second laser source unit 112, a third laser source unit 113, anda fourth laser source unit 114 (hereinafter, a laser source unit LU isused when describing the common characteristics of the first lasersource unit 111, the second laser source unit 112, the third lasersource unit 113, and the fourth laser source unit 114). For example, inthe embodiment, the laser source unit LU may be a multi-color laser(MCL).

Please refer to FIG. 3A to FIG. 3C. In the embodiment, the laser sourceunit LU may include multiple light-emitting elements LE arranged alongan arrangement direction DA, wherein the light-emitting elements LE onthe same column are connected in series with one another. Taking FIG. 3Bas an example, there are five light-emitting elements LE on the samecolumn, but the disclosure is not limited thereto. In addition, as shownin FIG. 3B, there are multiple pins PN next to the laser source unit LUto receive signals uploaded from a circuit board.

Moreover, as shown in FIG. 2B, in the embodiment, the first laser sourceunit 111, the second laser source unit 112, the third laser source unit113, and the fourth laser source unit 114 are respectively configured toprovide a first laser beam 50L1, a second laser beam 50L2, a third laserbeam 50L3, and a fourth laser beam 50L4. In the embodiment, thelight-emitting elements LE included in the first laser source unit 111,the second laser source unit 112, the third laser source unit 113, andthe fourth laser source unit 114 may be the same or different laserdiodes, and the first laser beam 50L1, the second laser beam 50L2, thethird laser beam 50L3, and the fourth laser beam 50L4 may bemonochromatic blue laser beams, but the embodiment is not limitedthereto. In other embodiments, the first laser beam 50L1, the secondlaser beam 50L2, the third laser beam 50L3, and the fourth laser beam50L4 may also be laser beams including multiple colors to increasebrightness while providing a rich color performance, so as to improvequality of image picture.

More specifically, as shown in FIG. 2A to FIG. 2C, in the embodiment,the first laser source unit 111 and the second laser source unit 112face the focusing lens 140, the first laser beam 50L1 and the secondlaser beam 50L2 are respectively incident on the focusing lens 140 alonga first direction D1, the first laser source unit 111 and the secondlaser source unit 112 are arranged along a second direction D2, and whenviewed along a third direction D3, the first laser source unit 111 andthe second laser source unit 112 do not overlap. In other words, theprojection of the first laser source unit 111 in the third direction D3and the projection of the second laser source unit 112 in the thirddirection D3 do not overlap. Moreover, as shown in FIG. 3A, the firstlaser source unit 111 includes a first side region RS1, the second lasersource unit 112 includes a second side region RS2, and when viewed alongthe second direction D2, the first side region RS1 overlaps with thesecond side region RS2. In other words, the projection of the first sideregion RS1 in the second direction D2 overlaps with the projection ofthe second side region RS2 in the second direction D2.

In more detail, in order to facilitate descriptions of the direction ofeach element or structure in the light source module 100, as shown inFIG. 2B to FIG. 2C, a rectangular coordinate system is defined asfollows, wherein the rectangular coordinate system uses the center ofthe focusing lens 140 as an origin O, the x-axis thereof issubstantially parallel to the second direction D2, the y-axis issubstantially parallel to the third direction D3, and the z-axis issubstantially parallel to the first direction D1. In other words, in theembodiment, the first direction D1, the second direction D2, and thethird direction D3 are perpendicular to one another. However, therectangular coordinate system is only coordinates with reference to theaccompanying drawings. Therefore, the coordinate terminologies used areonly for descriptive purposes and not to limit the disclosure.

As such, as shown in FIG. 3A, in the embodiment, the first laser sourceunit 111 and the second laser source unit 112 may be closely arranged asdisplaced up and down in the second direction D2 or arranged asdisplaced up and down within a tolerance range. For example, in theembodiment, a range of a shortest distance d1 between the first lasersource unit 111 and the second laser source unit 112 in the seconddirection D2 is less than or equal to 2 mm. In this way, the volume ofthe system can be reduced while avoiding the tolerance in terms ofassembly.

On the other hand, as shown in FIG. 2A to FIG. 2C and FIG. 3A, the firstlaser source unit 111 and the second laser source unit 112 are locatedon the same side of a same plane P. The first direction D1 isperpendicular to the plane P, and the second direction D2 and the thirddirection D3 are parallel to the plane P. In this way, the configurationof a heat dissipation module TM1 and a heat dissipation module TM2 maybe facilitated. For example, in the embodiment, the first laser sourceunit 111 and the second laser source unit 112 are disposed on the samesubstrate or on the surface of other elements (such as the heatdissipation module TM1 and the heat dissipation module TM2). In thisway, the disposition of the heat dissipation module TM1 and the heatdissipation module TM2 may be easily performed.

Further, in the embodiment, the heat dissipation module TM1 and the heatdissipation module TM2 may be respectively connected to the first lasersource unit 111 and the second laser source unit 112 to be respectivelydisposed behind the first laser source unit 111 and the second lasersource unit 112. Furthermore, as shown in FIG. 3A, the heat dissipationmodule TM1 and the heat dissipation module TM2 respectively havemultiple heat pipes HP, and the heat pipes HP extend along an extendingdirection DE. In the embodiment, the arrangement direction DA of thelight-emitting elements LE may be parallel to the extending direction DEof the heat pipes HP, but the embodiment is not limited thereto.

Furthermore, as shown in FIG. 3A, the first laser source unit 111includes a first fixing portion 111F and the second laser source unit112 includes a second fixing portion 112F. More specifically, the firstlaser source unit 111 and the second laser source unit 112 arerespectively fixed on the heat dissipation module TM1 and the heatdissipation module TM2 by the configuration of the first fixing portion111F and the second fixing portion 112F. For example, the first fixingportion 111F and the second fixing portion 112F may be screws torespectively lock the first laser source unit 111 and the second lasersource unit 112 onto the heat dissipation module TM1 and the heatdissipation module TM2.

Moreover, as shown in FIG. 3A, in the embodiment, the configurationregions of the heat pipes HP of the heat dissipation module TM1 and theheat pipes HP of the heat dissipation module TM2 need to avoid the firstfixing portion 111F and the second fixing portion 112F to avoidaffecting the configuration of the mechanism. More specifically, theheat pipes HP of the heat dissipation module TM1 are located below thefirst fixing portion 111F and the heat pipes HP of the heat dissipationmodule TM2 are located above the second fixing portion 112F. In otherwords, in the embodiment, the first laser source unit 111 and the secondlaser source unit 112 have the heat dissipation module TM1 and the heatdissipation module TM2 independent from each other and the heat pipes HPthereof. In this way, compared to the conventional case where two lasersource units are side by side and share the heat pipes of the same heatdissipation module, the first laser source unit 111 and the second lasersource unit 112 may respectively radiate heat to different sides by theheat dissipation module TM1 and the heat dissipation module TM2independent from each other, so as to improve the effect of heatdissipation.

On the other hand, as shown in FIG. 3A, the first fixing portion 111F islocated in the first side region RS1 and the second fixing portion 112Fis located in the second side region RS2. In other words, theprojections of the first fixing portion 111F and the second fixingportion 112F in the second direction D2 are located on an overlap regionRO shown in FIG. 3A. In this way, when viewed along the second directionD2, since the first fixing portion 111F substantially overlaps with thesecond fixing portion 112F in the second direction D2, the system volumecan be further reduced. For example, as shown in FIG. 3A, the centerline of the first fixing portion 111F and the center line of the secondfixing portion 112F are preferably aligned in the second direction D2,that is, the shortest distance between the projection of the center lineof the first fixing portion 111F in the second direction D2 and theprojection of the center line of the second fixing portion 112F in thesecond direction D2 is 0. In this way, the configuration area of theheat pipes HP is maximized to simultaneously take into account theefficacy of heat dissipation while reducing the system volume, but thedisclosure is not limited thereto. For example, as shown in FIG. 3C, thefirst fixing portion 111F and the second fixing portion 112F may beslightly displaced to achieve a similar heat dissipation effect. Indetail, as shown in FIG. 3C, a range of a shortest distance d2 betweenthe center line of the first fixing portion 111F and the center line ofthe second fixing portion 112F in the third direction D3 is less than orequal to 8 mm. In this way, the system volume can be further reduced.

Next, as shown in FIG. 2B to FIG. 2C, the third laser source unit 113faces one side of the second direction D2 and the fourth laser sourceunit 114 faces another side of the second direction D2. In more detail,the third laser source unit 113 faces the direction of the negativex-axis and the fourth laser source unit 114 faces the direction of thepositive x-axis, but the disclosure is not limited thereto. In otherembodiments, the configuration directions of the third laser source unit113 and the fourth laser source unit 114 may also be reversed.

In addition, as shown in FIG. 2A to FIG. 2C, the first light combiningunit 120 is disposed corresponding to the first laser source unit 111and the fourth laser source unit 114, wherein the first light combiningunit 120 has a first transmission region TR1 and a first reflectionregion RR1. The second light combining unit 130 is disposedcorresponding to the second laser source unit 112 and the third lasersource unit 113, wherein the second light combining unit 130 has asecond transmission region TR2 and a second reflection region RR2. Forexample, in the embodiment, the first reflection region RR1 of the firstlight combining unit 120 and the second reflection region RR2 of thesecond light combining unit 130 are comprised of a reflective substrateor a substrate coated with a highly reflective coating. On the otherhand, the first transmission region TR1 of the first light combiningunit 120 is substantially a region located below a first outer frame 121where no optical element is disposed, and the second transmission regionTR2 of the second light combining unit 130 is substantially a regionlocated above a second outer frame 132 where no optical element isdisposed. The first transmission region TR1 and the second transmissionregion TR2 are shown by the dashed lines in FIG. 2A, which areconfigured to compare the positions of the first transmission region TR1and the second transmission region TR2 in the drawing, and not toindicate that optical elements are disposed here.

Moreover, as shown in FIG. 3D, in the embodiment, the first lightcombining unit 120 may optionally include the first outer frame 121 andthe first outer frame 121 surrounds the first reflection region RR1, andthe second light combining unit 130 may also be optionally include thesecond outer frame 132 and the second outer frame 132 surrounds thesecond reflection region RR2. Specifically, in the embodiment, thefunctions of the first outer frame 121 and the second outer frame 132are mainly to facilitate the adjustment of the angle and position of thefirst light combining unit 120 and the second light combining unit 130with respect to each laser source unit LU. Specifically, in theembodiment, the first light combining unit 120 and the second lightcombining unit 130 may be simultaneously adjusted from above and belowor may be adjusted from behind by connecting an actuator to the firstouter frame 121 and the second outer frame 132. For example, theincluded angles between the first light combining unit 120 and thefourth laser source unit 114, and the second light combining unit 130and the third laser source unit 113 are preferably 45 degrees,respectively, so as to achieve a good light receiving efficiency.

Under the above configuration, as shown in FIG. 2A to FIG. 2C, the firsttransmission region TR1 is located on a transmission path of the firstlaser beam 50L1, the second transmission region TR2 is located on atransmission path of the second laser beam 50L2, and the first laserbeam 50L1 and the second laser beam 50L2 respectively pass through thefirst transmission region TR1 and the second transmission region TR2 tobe incident on the focusing lens 140 along the first direction D1. Onthe other hand, the first reflection region RR1 is located on atransmission path of the fourth laser beam 50L4, the fourth laser beam50L4 is transmitted to the focusing lens 140 via the first reflectionregion RR1, the second reflection region RR2 is located on atransmission path of the third laser beam 50L3, and the third laser beam50L3 is transmitted to the focusing lens 140 via the second reflectionregion RR2.

Further, as shown in FIG. 2A to FIG. 2C, the focusing lens 140 islocated on the transmission paths of the first laser beam 50L1, thesecond laser beam 50L2, the third laser beam 50L3, and the fourth laserbeam 50L4. The first laser beam 50L1, the second laser beam 50L2, thethird laser beam 50L3, and the fourth laser beam 50L4 are respectivelyincident on a first region, a second region, a third region, and afourth region of a light incident surface of the focusing lens 140, andthe projection positions of the first region, the second region, thethird region, and the fourth region on a rectangular coordinate planewith the center of the focusing lens 140 as the origin O arecorrespondingly located in each of a first quadrant, a second quadrant,a third quadrant, and a fourth quadrant of the rectangular coordinateplane, respectively. For example, in the embodiment, the first region,the second region, the third region, and the fourth region arerespectively the third quadrant, the first quadrant, the fourthquadrant, and the second quadrant of the rectangular coordinate plane.In this way, the first laser beam 50L1, the second laser beam 50L2, thethird laser beam 50L3, and the fourth laser beam 50L4 may be uniformlyincident on each region of the light incident surface of the focusinglens 140, thereby improving the light receiving efficiency. However, thedisclosure is not limited thereto. In other embodiments, persons skilledin the art may adjust the regions of the light incident surface of thefocusing lens 140 where the first laser beam 50L1, the second laser beam50L2, the third laser beam 50L3, and the fourth laser beam 50L4 areincident on according to actual requirements, such that the samecorrespond to other positions of the rectangular coordinate plane. Inthis way, after passing through the focusing lens 140, the first laserbeam 50L1, the second laser beam 50L2, the third laser beam 50L3, andthe fourth laser beam 50L4 may form a laser beam 50 to be incident on asubsequent optical module.

For example, as shown in FIG. 1 , in the embodiment, the wavelengthconversion module PM may be located on a transmission path of the laserbeam 50 and is configured to receive the laser beam 50. In addition, thewavelength conversion module PM includes a wavelength conversion region(not shown) and a non-conversion region (not shown). The wavelengthconversion module PM also includes a first driving device (not shown),suitable for enabling the wavelength conversion region (not shown) andthe non-conversion region (not shown) to correspondingly enter theirradiation range of the laser beam 50 at different times. Specifically,when the laser beam 50 is incident on the wavelength conversion regionof the wavelength conversion module PM, a wavelength converted beam 60Yof the illumination system LS may be formed via the wavelengthconversion region. In the embodiment, the wavelength converted beam 60Yis, for example, yellow light. When the laser beam 50 is incident on thenon-conversion region of the wavelength conversion module PM, the laserbeam 50 may be transmitted to the subsequent optical module by thewavelength conversion module PM.

As shown in FIG. 1 , the filter module FM is located on transmissionpaths of the excitation beam 50 and the wavelength converted beam 60Y,and the filter module FM has a filter region (not shown) and a lighttransmission region (not shown). The filter module FM also includes asecond driving device (not shown), suitable for enabling the filterregion (not shown) to correspondingly enter the irradiation range of thewavelength conversion beam 60Y at different times to be, for example,respectively filtered to form red-colored color light and green-coloredcolor light. On the other hand, the light transmission region (notshown) also correspondingly enters the irradiation range of theexcitation beam 50 transmitted to the filter module FM at differenttimes, such that the excitation beam 50 is passed through to formblue-colored color light. In this way, the excitation beam 50 and thewavelength conversion beam 60Y may be sequentially converted into theillumination beam 70 having multiple different colors.

In addition, as shown in FIG. 1 , in the embodiment, the illuminationsystem LS may optionally include an auxiliary light source AL. Theauxiliary light source AL is configured to emit an auxiliary beam 60R.The waveband of the auxiliary beam 60R and the waveband of thewavelength conversion beam 60Y at least partially overlap. For example,in the embodiment, the auxiliary light source AL is, for example, a redlaser source or a red-light-emitting diode light source, and theauxiliary beam 60R is red light. Moreover, as shown in FIG. 1 , thefilter module FM is also located on the transmission path of theauxiliary beam 60R. In addition, the light transmission region (notshown) also correspondingly enters the irradiation range of theauxiliary beam 60R transmitted to the filter module FM at differenttimes, such that the auxiliary beam 60R is passed through to form ared-colored color light. In this way, the illumination system LS mayincrease the red light ratio in the illumination beam 70 by theconfiguration of the auxiliary light source AL, so as to improve the redcolor performance of the projected picture.

On the other hand, as shown in FIG. 1 , in the embodiment, theprojection device 200 further includes a light homogenizing element LH,located on the transmission paths of the excitation beam 50 and thewavelength conversion beam 60Y. In the embodiment, the lighthomogenizing element LH includes an integration rod, but the disclosureis not limited thereto. In more detail, as shown in FIG. 1 , when thebeam is transmitted to the light homogenizing element LH via theillumination system LS, the light homogenizing element LH may homogenizethe excitation beam 50 and the wavelength conversion beam 60Y, andtransmit the illumination beam 70 to the light valve 210.

Next, as shown in FIG. 1 , the light valve 210 is located on thetransmission path of the illumination beam 70 and is suitable forconverting the illumination beam 70 into the image beam 80. Theprojection lens 220 is located on the transmission path of the imagebeam 80 and is suitable for projecting the image beam 80 onto a screenor wall (not shown) to form an image picture. After the illuminationbeam 70 converges on the light valve 210, the light valve 210sequentially converts the illumination beam 70 into the image beam 80 tobe transmitted to the projection lens 220. Therefore, the image beam 80converted by the light valve 210 is projected out of the projectiondevice 200 to form the image picture.

As such, in the embodiment, by configuring the first laser source unit111 and the second laser source unit 112 with a displaced arrangement,the projection device 200 and the light source module 100 enable thefirst laser source unit 111 and the second laser source unit 112 to bedisposed on the same plane and to have the heat dissipation module TM1and the heat dissipation module TM2 independent from each other and theheat pipes HP thereof, so as to realize miniaturization of theprojection device 200 and the illumination system LS and to have asimple light path design while taking into account the efficacy of heatdissipation. In addition, by disposing the first light combining unit120 and the second light combining unit 130, the projection device 200and the light source module 100 enable the first laser beam 50L1, thesecond laser beam 50L2, the third laser beam 50L3, and the fourth laserbeam 50L4 to be uniformly incident on each region of the light incidentsurface of the focusing lens 140, so as to improve the light receivingefficiency, such that the illumination beam 70 has a good colorperformance.

It is worth noting that in the embodiment of FIG. 3D, although the firstlight combining unit 120 and the second light combining unit 130 areexemplified by the first outer frame 121 surrounding the firstreflection region RR1 and the second outer frame 132 surrounding thesecond reflection region RR2, the disclosure is not limited thereto. Inother embodiments, the first outer frame 121 may also surround the firstreflection region RR1 and the first transmission region TR1, and thesecond outer frame 132 may also surround the second reflection regionRR2 and the first transmission region TR1. Persons skilled in the artmay make appropriate modifications to the structure of a projectiondevice after referring to the disclosure to achieve effects andadvantages similar to the projection device 200, but the projectiondevice still fall within the scope of the disclosure. Some otherembodiments are described below as illustrations.

FIG. 4A to FIG. 4B are schematic view of structures of a first lightcombining unit and a second light combining unit according to anotherembodiment of the disclosure. FIG. 5A to FIG. 5B are schematic views ofstructures of a first light combining unit and a second light combiningunit according to yet another embodiment of the disclosure. In theembodiment, as shown in FIG. 4A and FIG. 5A, first light combining units420 and 520 are similar to the first light combining unit 120, and asshown in FIG. 4B and FIG. 5B, second light combining units 430 and 530are similar to the second light combining unit 130, and the differencesare described below. As shown in FIG. 4A and FIG. 5A, the first lightcombining units 420 and 520 further include first outer frames 421 and521, and the first outer frames 421 and 521 surround a first lightcombining region CR1 formed by combining a first transmission region TR1and a first reflection region RR1. Moreover, as shown in FIG. 4B andFIG. 5B, second outer frames 432 and 532 surround a second lightcombining region CR2 formed by combining a second transmission regionTR2 and a second reflection region RR2.

On the other hand, as shown in FIG. 4A and FIG. 4B, the firsttransmission region TR1 of the first light combining unit 420 and thesecond transmission region TR2 of the second light combining unit 430are comprised of a light-transmitting substrate to be respectivelyconnected to the first outer frame 421 and the second outer frame 432.Alternatively, as shown in FIG. 5A and FIG. 5B, the first transmissionregion TR1 of the first light combining unit 520 and the secondtransmission region TR2 of the second light combining unit 530 may nothave any optical element, that is, the first outer frame 521 and thesecond outer frame 532 may form a hollow structure to respectively formthe first transmission region TR1 of the first light combining unit 520and the second transmission region TR2 of the second light combiningunit 530.

In this way, when the first light combining units 420 and 520 and thesecond light combining units 430 and 530 are applied to the light sourcemodule 100 and the projection device 200, the first light combiningunits 420 and 520 and the second light combining units 430 and 530 mayalso achieve the function of adjusting the angle and position of thefirst light combining units 420 and 520 and the second light combiningunits 430 and 530 relative to each laser source unit LU by theconfiguration of the first outer frames 421 and 521 and the second outerframes 432 and 532, so as to achieve effects and advantages similar tothe first light combining unit 120 and the second light combining unit130, which will not be reiterated here. In addition, when the firstlight combining units 420 and 520 and the second light combining units430 and 530 are applied to the light source module 100 and theprojection device 200, the light source module 100 and the projectiondevice 200 may also achieve similar effects and advantages, which willnot be reiterated here.

On the other hand, in the foregoing embodiment, although the projectiondevice 200 is exemplified by having the wavelength conversion module PMand the filter module FM, the disclosure is not limited thereto. Inother embodiments, when the light source module 100 of the embodimentsimultaneously includes a red laser diode, a green laser diode, and ablue laser diode, the projection device 200 may omit the wavelengthconversion module PM and the filter module FM, and use the laser beam 50formed by the light source module 100 combining the first laser beam50L1, the second laser beam 50L2, the third laser beam 50L3, and thefourth laser beam 50L4 as the illumination beam 70, and enable theillumination beam 70 to be transmitted the subsequent optical element.Persons skilled in the art may make appropriate modifications to thestructure of a projection device after referring to the disclosure toachieve effects and advantages similar to the projection device 200, butthe projection device still fall within the scope of the disclosure.

In summary, the embodiments of the disclosure have at least one of thefollowing advantages or effects. In the embodiments of the disclosure,by configuring the first laser source unit and the second laser sourceunit with a displaced arrangement, the projection device and the lightsource module enable the first laser source unit and the second lasersource unit to be disposed on the same plane and to have the heatdissipation modules independent from each other and the heat pipesthereof, so as to realize miniaturization of the projection device andthe light source module and to have a simple light path design whiletaking into account the efficacy of heat dissipation. In addition, bydisposing the first light combining unit and the second light combiningunit, the projection device and the light source module enable the firstlaser beam, the second laser beam, the third laser beam, and the fourthlaser beam to be uniformly incident on each region of the light incidentsurface of the focusing lens, so as to improve the light receivingefficiency, such that the illumination beam can have a good colorperformance.

The foregoing description of the preferred embodiments of the inventionhas been presented for purposes of illustration and description. It isnot intended to be exhaustive or to limit the invention to the preciseform or to exemplary embodiments disclosed. Accordingly, the foregoingdescription should be regarded as illustrative rather than restrictive.Obviously, many modifications and variations will be apparent topractitioners skilled in this art. The embodiments are chosen anddescribed in order to best explain the principles of the invention andits best mode practical application, thereby to enable persons skilledin the art to understand the invention for various embodiments and withvarious modifications as are suited to the particular use orimplementation contemplated. It is intended that the scope of theinvention be defined by the claims appended hereto and their equivalentsin which all terms are meant in their broadest reasonable sense unlessotherwise indicated. Therefore, the term “the invention”, “the presentinvention” or the like does not necessarily limit the claim scope to aspecific embodiment, and the reference to particularly preferredexemplary embodiments of the invention does not imply a limitation onthe invention, and no such limitation is to be inferred. The inventionis limited only by the spirit and scope of the appended claims. Theabstract of the disclosure is provided to comply with the rulesrequiring an abstract, which will allow a searcher to quickly ascertainthe subject matter of the technical disclosure of any patent issued fromthis disclosure. It is submitted with the understanding that it will notbe used to interpret or limit the scope or meaning of the claims. Anyadvantages and benefits described may not apply to all embodiments ofthe invention. It should be appreciated that variations may be made inthe embodiments described by persons skilled in the art withoutdeparting from the scope of the present invention as defined by thefollowing claims. Moreover, no element and component in the presentdisclosure is intended to be dedicated to the public regardless ofwhether the element or component is explicitly recited in the followingclaims.

What is claimed is:
 1. A light source module, configured to provide alaser beam, the light source module comprising: a plurality of lasersource units, wherein the laser source units comprise a first lasersource unit, a second laser source unit, a third laser source unit and afourth laser source unit, which are respectively configured to provide afirst laser beam, a second laser beam, a third laser beam and a fourthlaser beam; a first light combining unit, wherein the first lightcombining unit has a first reflection region and a first transmissionregion; a second light combining unit, wherein the second lightcombining unit has a second reflection region and a second transmissionregion; and a focusing lens, located on transmission paths of the firstlaser beam, the second laser beam, the third laser beam and the fourthlaser beam, wherein the first laser beam, the second laser beam, thethird laser beam and the fourth laser beam are respectively incident onthe focusing lens along a first direction, the first laser source unitand the second laser source unit are arranged along a second direction,when viewed along a third direction, the first laser source unit and thesecond laser source unit do not overlap, and when viewed along thesecond direction, the first laser source unit and the second lasersource unit are displaced up and down, and the first laser source unitand the second laser source unit are partially overlapped, the thirdlaser beam is reflected by the second reflection region of the secondlight combining unit, and the fourth laser beam is reflected by thefirst reflection region of the first light combining unit, and the firstdirection, the second direction, and the third direction areperpendicular to one another.
 2. The light source module according toclaim 1, wherein a range of a shortest distance between the first lasersource unit and the second laser source unit in the second direction isless than or equal to 2 mm.
 3. The light source module according toclaim 1, wherein the first laser source unit comprises a first sideregion, the second laser source unit comprises a second side region, andwhen viewed along the second direction, the first side region overlapswith the second side region.
 4. The light source module according toclaim 3, wherein the first laser source unit comprises a first fixingportion, the first fixing portion is located in the first side region,the second laser source unit comprises a second fixing portion, and thesecond fixing portion is located in the second side region.
 5. The lightsource module according to claim 4, wherein when viewed along the seconddirection, a range of a shortest distance between a center line of thefirst fixing portion and a center line of the second fixing portion inthe third direction is less than or equal to 8 mm.
 6. The light sourcemodule according to claim 3, wherein the first laser source unit and thesecond laser source unit are located on a same plane, the firstdirection is perpendicular to the plane, and the second direction andthe third direction are parallel to the plane.
 7. The light sourcemodule according to claim 1, wherein the third laser source unit facesone side of the second direction, the fourth laser source unit facesanother side of the second direction.
 8. The light source moduleaccording to claim 1, wherein the first light combining unit is disposedcorresponding to the first laser source unit and the fourth laser sourceunit, and the second light combining unit is disposed corresponding tothe second laser source unit and the third laser source unit.
 9. Thelight source module according to claim 8, wherein the first transmissionregion is located on a transmission path of the first laser beam, thesecond transmission region is located on a transmission path of thesecond laser beam, and the first laser beam and the second laser beamrespectively pass through the first transmission region and the secondtransmission region to be transmitted to the focusing lens.
 10. Thelight source module according to claim 9, wherein the first lightcombining unit further comprises a first outer frame, the first outerframe surrounds a first light combining region formed by combining thefirst transmission region and the first reflection region, the secondlight combining unit further comprises a second outer frame, and thesecond outer frame surrounds a second light combining region formed bycombining the second transmission region and the second reflectionregion.
 11. The light source module according to claim 9, wherein thefirst laser beam, the second laser beam, the third laser beam, and thefourth laser beam are respectively incident on a first region, a secondregion, a third region, and a fourth region of a light incident surfaceof the focusing lens, and projection positions of the first region, thesecond region, the third region, and the fourth region on a rectangularcoordinate plane with a center of the focusing lens as an origin arecorrespondingly located in a third quadrant, a first quadrant, a fourthquadrant, and a second quadrant of the rectangular coordinate plane,respectively.
 12. A projection device, comprising an illuminationsystem, suitable for providing an illumination beam, the projectiondevice further comprising: a light source module, configured to providea laser beam to form the illumination beam, comprising: a plurality oflaser source units, wherein the laser source units comprise a firstlaser source unit, a second laser source unit, a third laser source unitand a fourth laser source unit, which are respectively configured toprovide a first laser beam, a second laser beam, a third laser beam anda fourth laser beam; a first light combining unit, wherein the firstlight combining unit has a first reflection region and a firsttransmission region; a second light combining unit, wherein the secondlight combining unit has a second reflection region and a secondtransmission region; and a focusing lens, located on transmission pathsof the first laser beam, the second laser beam, the third laser beam andthe fourth laser beam, wherein the first laser beam, the second laserbeam, the third laser beam and the fourth laser beam are respectivelyincident on the focusing lens along a first direction, the first lasersource unit and the second laser source unit are arranged along a seconddirection, when viewed along a third direction, the first laser sourceunit and the second laser source unit do not overlap, when viewed alongthe second direction, the first laser source unit and the second lasersource unit are displaced up and down, and the first laser source unitand the second laser source unit are partially overlapped, and the firstdirection, the second direction, and the third direction areperpendicular to one another; a light valve, disposed on a transmissionpath of the illumination beam and configured to convert the illuminationbeam into an image beam; and a projection lens, disposed on atransmission path of the image beam and configured to project the imagebeam out of the projection device.
 13. The projection device accordingto claim 12, wherein a range of a shortest distance between the firstlaser source unit and the second laser source unit in the seconddirection is less than or equal to 2 mm.
 14. The projection deviceaccording to claim 12, wherein the first laser source unit comprises afirst side region, the second laser source unit comprises a second sideregion, and when viewed along the second direction, the first sideregion overlaps with the second side region.
 15. The projection deviceaccording to claim 14, wherein the first laser source unit comprises afirst fixing portion, the first fixing portion is located in the firstside region, the second laser source unit comprises a second fixingportion, and the second fixing portion is located in the second sideregion.
 16. The projection device according to claim 15, wherein whenviewed along the second direction, a range of a shortest distancebetween a center line of the first fixing portion and a center line ofthe second fixing portion in the third direction is less than or equalto 8 mm.
 17. The projection device according to claim 14, wherein thefirst laser source unit and the second laser source unit are located ona same plane, the first direction is perpendicular to the plane, and thesecond direction and the third direction are parallel to the plane. 18.The projection device according to claim 12, wherein the third lasersource unit faces one side of the second direction, the fourth lasersource unit faces another side of the second direction.
 19. Theprojection device according to claim 18, wherein the first lightcombining unit is disposed corresponding to the first laser source unitand the fourth laser source unit, and the second light combining unit isdisposed corresponding to the second laser source unit and the thirdlaser source unit.
 20. The projection device according to claim 19,wherein the first transmission region is located on a transmission pathof the first laser beam, the second transmission region is located on atransmission path of the second laser beam, and the first laser beam andthe second laser beam respectively pass through the first transmissionregion and the second transmission region to be transmitted to thefocusing lens.
 21. The projection device according to claim 20, whereinthe first light combining unit further comprises a first outer frame,the first outer frame surrounds a first light combining region formed bycombining the first transmission region and the first reflection region,the second light combining unit further comprises a second outer frame,and the second outer frame surrounds a second light combining regionformed by combining the second transmission region and the secondreflection region.
 22. The projection device according to claim 18,wherein the first laser beam, the second laser beam, the third laserbeam, and the fourth laser beam are respectively incident on a firstregion, a second region, a third region, and a fourth region of a lightincident surface of the focusing lens, and projection positions of thefirst region, the second region, the third region, and the fourth regionon a rectangular coordinate plane with a center of the focusing lens asan origin are correspondingly located in a third quadrant, a firstquadrant, a fourth quadrant, and a two quadrant of the rectangularcoordinate plane, respectively.